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Onions help in promoting hair growth
The number one reason onion juice is good for hair growth is it contains sulfur, which is also found in amino acids. And keratin is also sulfur-rich and is required for strong hair. When applied to the scalp, onion juice provides this extra sulfur for stronger and thicker hair. This sulfur can also stimulate collagen production which, in turn, aids in the production of healthy skin cells, and, hair growth.